/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.commons.partition.executor.hash;

import org.apache.iotdb.common.rpc.thrift.TSeriesPartitionSlot;
import org.apache.iotdb.commons.partition.executor.SeriesPartitionExecutor;

public class BKDRHashExecutor extends SeriesPartitionExecutor {

    private static final int seed = 131;

    public BKDRHashExecutor(int deviceGroupCount) {
        super(deviceGroupCount);
    }

    @Override
    public TSeriesPartitionSlot getSeriesPartitionSlot(String device) {
        int hash = 0;

        for (int i = 0; i < device.length(); i++) {
            hash = hash * seed + (int) device.charAt(i);
        }
        hash &= Integer.MAX_VALUE;

        return new TSeriesPartitionSlot(hash % seriesPartitionSlotNum);
    }
}
